PC restarts itself after GPU upgrade

Jan 4, 2019
I upgraded my GPU recently. I had MSI gtx970 gaming 4G before. Now I have Asus ROG STRIX RTX 2070 OC.
After upgrading my GPU, my computer started to restart itself sometimes. There is no error, no blue screen,nothing. It just restart itself. There is nothing wrong when idle but when I play games it is different. Let me give some examples:

- I tried to FurMark couple times, pc restarted itself. After 1 hour I tried again, it ran for 10-15 min without any issues and didn't restart.(?)
- I used Total War Warhammer 2 in-game benchmarks, it restarted one time, it didn't other time, succesfully benchmarked.
- Played Rainbow Six Siege, For Honor for 3-4 hours with ultra settings, no restarts, everthing seems fine.
- I tried to play Wither 3 with ultra settings. Restarted after 2 min one time, other time I ran around and engaged combat for 5 min, it didn't restart but it was laggy sometimes.

And here is my specs:
- Processor: Intel Core i7-4790K
- Motherboard: MSI Z97-GAMING 5
- RAM: Corsair Vengeance Pro 16 GB (2 x 8 GB) DDR3-1600
- Graphics Card: Asus ROG Strix RTX 2070 8 GB ( MSI GTX 970 before upgrade)
- PSU: Corsair VS650(orange) 650W

Drivers up-to date. PC cleaned recently. New thermal paste on CPU. Temps seems fine. 50-65 C when played Rainbow Six Siege and For Honor for 2-3 hours.
My friends said my PSU is bad. I think of it first when this happened but I am no expert.
Any help is appreciated.


the new GPU is eating more power than the old (30W). that is not the best PSU, its actually the worst corsair has available now.

My canned random reboot Rant
Random reboots are usually caused by the PSU, the RAM or software AND in that order of likely-hood.
PSU - If you can borrow/swap a PSU for testing. sibling/friend you can swap out the PSU and each system will be testing the other.
RAM - run the system with one stick of RAM see if stability returns if not Test all the RAM with memtest 86 for three passes or overnight. if you get no 0 errors after more than three passes the ram is good. with the random reboots I would suggest running this test after the PSU swap or after the PSU has been cleared.
Software - Drivers or other issues can cause reboots. Boot to a linux distro on a USB drive. mint linux will boot to memtest86. you can run the OS from the USB and await reboot.
end canned rant
Jan 4, 2019

Thank you for your answer.

I tried to run my system with one stick of RAM but it didn't help. I'm in my final exam weeks so I will try to memtest86 and the software solution as soon as my exams finished.
As for the PSU, I don't have anyone to borrow or swap one but I started to renew my rig and thinking about changing other parts too. It is a bad PSU as you said. Might as well buy a new one. If it is the problem, perfect, if not I'll have a nice and new PSU.
I'll update the thread when I try them.

UPDATE: I got Aerocool P7 750W as a PSU and set it up. It looks like PSU was the issue. Everything seems fine now.